So I guess you should be using Tor or protonVPN if you don't want to hide your access logs from swiss authorities.
They could have done a better job at explaining the threat model to the wider public, but I wouldn't say they are useless. I think it's advisable to not have a knee jerk reaction.
> Under no circumstances can our encryption be bypassed, meaning emails, attachments, calendars, files, etc. cannot be compromised by legal orders.
> [..] We will also clarify that the use of our onion site (details below) is highly recommended for users who want anonymity
Source: https://protonmail.com/blog/climate-activist-arrest/
So I guess you should be using Tor or protonVPN if you don't want to hide your access logs from swiss authorities.
They could have done a better job at explaining the threat model to the wider public, but I wouldn't say they are useless. I think it's advisable to not have a knee jerk reaction.
EDIT: link to their published threat model: https://protonmail.com/blog/protonmail-threat-model/